The electromagnetic energy radiation and coupling by transmitting or through space in microstrip circuits can induce electromagnetic compatibility go to bad. In this paper, the electric and magnetic fields in a given microstrip structure are numerically calculated by FDTD (Finite-Difference Time-Domain Method) when microwave frequency varying from 2GHz to 4GHz, and using the numerical results combined with the boundary conditions of electromagnetic field, the electromagnetic energy coupling coefficients are calculated. Study shows the electromagnetic energy coupling through space really exists in microstrip circuit and the coupling coefficient will get to maximum at certain frequency, which may bring instability to circuit, so the signal frequency should be taken into account so that circuit can work in good order.
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